MIM products are sintered to approximately 98% density below theoretical, so its chemical, physical, elastic and thermodynamic will be affected by MIM sintering process compare to handbooks information.
ZCMIM aim to provide high quality MIM parts for our customers, so we consider materials affection in MIM sintering process. It will assist our engineering team offer multiple treatment suggestion for your projects.
Mechanical property: MIM technology products have same tensile match other manufacturing routes.
Fatigue strength and fracture toughness: For high toughness metal materials, we never need to worry about this issue. But in other case, materials testing is recommended, because of large grain size and residual porosity associated with MIM.
Corrosion resistance: Stainless steel with MIM method will cause corrosion resistance issue, in reason of chromium preferential surface evaporation during sintering process will degrade resistance to corrosion attack. But, with proper post-sintering and surface treatment, final MIM parts can perform well in general corrosion resistance of various media.
Biocompatibility: MIM parts are applied more and more in medical and dental area, so biocompatibility become equivalent to other routes. In that case, post-sintering and electrochemical treatment are required to re-uniform MIM parts surface chemistry for biocompatilility.
Wear performance: In MIM process, mix hard phases into feedstock will improve MIM parts wearing behaviour. Such as, MIM tool steel treated with low concentration calcium difluoride has significant dry wear rate than wrought tool steel. Add titanium nitride or chromiu boride to stainless steel will improve final product wear resistance.